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You are here: myPetSmart.com > Pet Care Library > Ask An Expert > Answered Questions > I Have A 30 Gallon Tank That Has Had Fish In It For 2 Weeks

I have a 30 gallon tank, that has had fish in it for 2 weeks now. I had 3 neon t...


I have a 30 gallon tank, that has had fish in it for 2 weeks now. I had 3 neon tetras, a pleco, and 11 guppies(4 male and 7 female) and the pleco and 5 guppies have died. None of the tetras have died at all and are acting perfectly healthy. The guppies are the same way but then all of the sudden i find one of the guppies dead. What could be causing this?

Usually when many fish die suddenly, it is due to poor water quality. The first step is to do a 25% water change in the aquarium, adding dechlorinator to the fresh water. Test the water to see if it has high levels of ammonia or nitrite, which can be toxic to fish. It is easy to check using a water test strip. PetSmart stores also offer free water testing. Regular water changes are necessary for healthy fish; weekly to every few weeks depending on size of aquarium and quantity of fish. Make sure the aquarium has adequate filtration, and the fish are not too crowded or being over fed.


23 Jan 2011 5:40 pm

BeavisMom62 said:

Your tank wasn't cycled. You need to test your water at least every other day and do partial water changes at least weekly to remove the toxins in the water.

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